| /******************************************************************************* |
| * Copyright (c) 2004, 2010 Tasktop Technologies and others. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * https://www.eclipse.org/legal/epl-2.0 |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Tasktop Technologies - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.mylyn.internal.commons.ui.screenshots; |
| |
| import java.util.Set; |
| |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.core.runtime.jobs.Job; |
| import org.eclipse.swt.widgets.Display; |
| import org.eclipse.swt.widgets.Shell; |
| import org.eclipse.swt.widgets.TreeItem; |
| |
| /** |
| * @author Mik Kersten |
| * @author Steffen Pingel |
| */ |
| public class SwtUtil { |
| |
| public static final long FADE_RESCHEDULE_DELAY = 80; |
| |
| public static final int FADE_IN_INCREMENT = 15; |
| |
| public static final int FADE_OUT_INCREMENT = -20; |
| |
| public static void collectItemData(TreeItem[] items, Set<Object> allVisible) { |
| for (TreeItem item : items) { |
| allVisible.add(item.getData()); |
| collectItemData(item.getItems(), allVisible); |
| } |
| } |
| |
| public static FadeJob fastFadeIn(Shell shell, IFadeListener listener) { |
| return new FadeJob(shell, 2 * FADE_IN_INCREMENT, FADE_RESCHEDULE_DELAY, listener); |
| } |
| |
| public static FadeJob fadeIn(Shell shell, IFadeListener listener) { |
| return new FadeJob(shell, FADE_IN_INCREMENT, FADE_RESCHEDULE_DELAY, listener); |
| } |
| |
| public static FadeJob fadeOut(Shell shell, IFadeListener listener) { |
| return new FadeJob(shell, FADE_OUT_INCREMENT, FADE_RESCHEDULE_DELAY, listener); |
| } |
| |
| public static class FadeJob extends Job { |
| |
| private final Shell shell; |
| |
| private final int increment; |
| |
| private volatile boolean stopped; |
| |
| private volatile int currentAlpha; |
| |
| private final long delay; |
| |
| private final IFadeListener fadeListener; |
| |
| public FadeJob(Shell shell, int increment, long delay, IFadeListener fadeListener) { |
| super(Messages.SwtUtil_Fading); |
| if (increment < -255 || increment == 0 || increment > 255) { |
| throw new IllegalArgumentException("-255 <= increment <= 255 && increment != 0"); //$NON-NLS-1$ |
| } |
| if (delay < 1) { |
| throw new IllegalArgumentException("delay must be > 0"); //$NON-NLS-1$ |
| } |
| this.currentAlpha = shell.getAlpha(); |
| this.shell = shell; |
| this.increment = increment; |
| this.delay = delay; |
| this.fadeListener = fadeListener; |
| |
| setSystem(true); |
| schedule(delay); |
| } |
| |
| @Override |
| protected void canceling() { |
| stopped = true; |
| } |
| |
| private void reschedule() { |
| if (stopped) { |
| return; |
| } |
| schedule(delay); |
| } |
| |
| public void cancelAndWait(final boolean setAlpha) { |
| if (stopped) { |
| return; |
| } |
| cancel(); |
| Display.getDefault().syncExec(new Runnable() { |
| public void run() { |
| if (setAlpha) { |
| shell.setAlpha(getLastAlpha()); |
| } |
| } |
| }); |
| } |
| |
| @Override |
| protected IStatus run(IProgressMonitor monitor) { |
| if (stopped) { |
| return Status.OK_STATUS; |
| } |
| |
| currentAlpha += increment; |
| if (currentAlpha <= 0) { |
| currentAlpha = 0; |
| } else if (currentAlpha >= 255) { |
| currentAlpha = 255; |
| } |
| |
| Display.getDefault().syncExec(new Runnable() { |
| public void run() { |
| if (stopped) { |
| return; |
| } |
| |
| if (shell.isDisposed()) { |
| stopped = true; |
| return; |
| } |
| |
| shell.setAlpha(currentAlpha); |
| |
| if (fadeListener != null) { |
| fadeListener.faded(shell, currentAlpha); |
| } |
| } |
| }); |
| |
| if (currentAlpha == 0 || currentAlpha == 255) { |
| stopped = true; |
| } |
| |
| reschedule(); |
| return Status.OK_STATUS; |
| } |
| |
| private int getLastAlpha() { |
| return (increment < 0) ? 0 : 255; |
| } |
| |
| } |
| |
| public static interface IFadeListener { |
| |
| public void faded(Shell shell, int alpha); |
| |
| } |
| |
| } |